var Sce_left = document.getElementById("Sce_left");
var a = 1;

function a1_click() {

	switch(a % 2) {
		case 1:
			Sce_left.style.backgroundImage = "url(img/201612191444322d3b38-1.jpg)"
			break;
		case 0:
			Sce_left.style.backgroundImage = "url(img/2016040117224114977a.jpg)"
			break;
		default:
			break;
	}
	a++;
}

var time = 200;
var timer = setInterval(function() {
	switch(time % 200) {
		case 0:
			Sce_left.style.backgroundImage = "url(img/2016040117224114977a.jpg)"
			break;
		case 100:
			Sce_left.style.backgroundImage = "url(img/201612191444322d3b38-1.jpg)"
			break;
		default:
			break;
	}
	time++;
}, 50	)

var Sce_right = document.getElementById("Sce_right");
var Sce_right_top = document.getElementById("Sce_right_top");
var Sce_right_bw = document.getElementById("Sce_right_bw");
var Sce_right_sw = document.getElementById("Sce_right_sw");
var time1 = 0;
var time2 = 0;
setInterval(function() {
	time2++;
	switch(time2 % 3) {
		case 1:
			Sce_right_top.style.backgroundImage = "url(img/tbg2.png)";
			Sce_right.style.backgroundImage = "url(img/pic2.jpg)"
			Sce_right_bw.style.backgroundImage = "url(img/t2.png)";
			Sce_right_sw.style.backgroundImage = "url(img/w2.png)"
			break;
		case 2:
			Sce_right_top.style.backgroundImage = "url(img/tbg3.png)";
			Sce_right.style.backgroundImage = "url(img/pic3.jpg)"
			Sce_right_bw.style.backgroundImage = "url(img/t3.png)";
			Sce_right_sw.style.backgroundImage = "url(img/w3.png)";
			break;
		case 0:
			Sce_right_top.style.backgroundImage = "url(img/tbg1.png)";
			Sce_right.style.backgroundImage = "url(img/pic1.jpg)"
			Sce_right_bw.style.backgroundImage = "url(img/t1.png)";
			Sce_right_sw.style.backgroundImage = "url(img/w1.png)";
			break;
		default:
			break;
	}
}, 5500)